Komatsu PC210-8, Shop Manual

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UEN00241-01 40 Troubleshooting
26
PC210, 230, 240-8
Failure code [CA488] Chg Air Temp High Torque Derate 1
Failure code [CA553] Rail Press High Error 1
User code Failure code
Trouble
Charge air temperature high torque derate
(Engine controller system)
E15 CA488
Contents of
trouble
• Temperature signal of boost pressure/temperature sensor exceeded control upper temperature limit.
Action of
controller
• Limits output and continues operation.
Problem that
appears on
machine
• Engine output lowers.
Related infor-
mation
• Boost temperature can be checked with monitoring function. (Code: 18500 Boost temperature)
• Method of reproducing failure code: Start engine.
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1
Lowering of cooling perfor-
mance of aftercooler
Cooling performance of aftercooler may be low. Check following
points directly.
• Looseness and breakage of fan belt.
• Insufficiency of cooling air
• Clogging of aftercooler fins
2
Abnormal rise of turbo-
charger outlet temperature Outlet temperature of turbocharger may be abnormally high. Check
related parts directly.
3 Defective engine controller
If causes 1 – 2 are not detected, engine controller may be defective.
(Since trouble is in system, troubleshooting cannot be carried out.)
User code Failure code
Trouble
Common rail pressure high error
(Engine controller system)
E11 CA553
Contents of
trouble
• There is high pressure error in common rail circuit.
Action of
machine monitor • None in particular.
Problem that
appears on
machine
• Engine sound becomes large when no or light load is applied.
• Engine output lowers.
Related infor-
mation
• Common rail pressure can be checked with monitoring function.
(Code: 36400 Common rail pressure)
• Method of reproducing failure code: Start engine.
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1 Defect in related system If another failure code is displayed, carry out troubleshooting for it.
2
Defective connection of
ground terminal
Ground terminal may be connected defectively. Check following ter-
minals directly.
• Ground terminal of machine ((–) terminal of battery)
• Ground terminal of engine
• Ground terminal of engine controller
• Ground terminal of starting motor
3
Breakage of O-ring of supply
pump actuator
O-ring of supply pump actuator may be broken. Check it directly.